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How to recover oversized MCP results without re-running calls with MCP Slim Guard

Use result_ref and read_result to pull exact pieces of a big tool response.

Short answer: Run mcp-slim-guard start in the project so the default Compact mode is active; then make the tool call through the host and note the result_ref in the first response; call read_result with a query to get up to three bounded local fragments. All steps.

Who it is forAn agent operator whose host hits context limits when an upstream tool returns a very large result.

The problemA large tool response floods the context window, and re-running the upstream call to see more of it may be costly or change the result.

The outcomeThe host reads the exact stored snapshot in bounded fragments or by cursor, and the upstream tool is not invoked again.

What you need first

  • A reviewed checkout of the lennney/mcp-slim-guard repository (0.1.1-alpha.2 is not yet published to npm)
  • npm to run ci, build, and link the package
  • A project directory that already has an MCP configuration
  • An upstream MCP server definition you are authorized to use

Steps

  1. Run mcp-slim-guard start in the project so the default Compact mode is active.
  2. Make the tool call through the host and note the result_ref in the first response.
  3. Call read_result with a query to get up to three bounded local fragments.
  4. Or call read_result without query and follow next_cursor to recover the exact snapshot. Do not combine query with cursor.

Prompt for your agent

In the lennney/mcp-slim-guard setup at <project-path>, trigger a tool call that returns a large result and capture its result_ref. Use read_result with a query to retrieve matching fragments, and confirm the fragments come from the same snapshot without a second upstream invocation.

Caveat. Recovery only works on responses that need recoverable delivery, and the README does not describe the size threshold that triggers it.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for lennney/mcp-slim-guard and "Recover oversized MCP results without re-running calls"

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